climatol (version 4.0.0)

IDFcurves: Obtain Intensity-Duration-Frequency curves

Description

Intensity-Duration-Frequency curves are obtained from a sub-hourly time series of precipitation by adjusting Generalized Extreme Value distribution to annual maxima of different time intervals.

Usage

IDFcurves(prdat, stname, clmn=1:2, tz='utc', na.code=NA,
prunits='mm', mindpy=0.8, gumbel=TRUE, timeaggr=c(10,20,30,60,120,180,360,720),
retper=c(5,10,20,30,50,75,100),...)

Value

A table of maximum precipitation accumulations is returned invisibly.

Arguments

prdat

Data frame with Time (as POSIXct) and sub-hourly precipitation data.

stname

Station name.

clmn

Columns where Time and precipitation data are located in prdat.

tz

Time zone ['utc' by default].

na.code

Numeric missing data code.

prunits

Precipitation units [mm].

mindpy

Minimum available data proportion to process data in any year.

gumbel

Adjust a Gumbel distribution? [TRUE].

timeaggr

Time intervals (in minutes) on which to aggregate precipitation.

retper

Return periods (in years) for extreme precipitation estimation.

...

Additional graphic parameters.

Details

The precipitation time series must be provided as a data frame with POSIXct times in the first column and precipitation in the second. However, these data can be in other columns of a wider data frame if the columns containing these variables are defined in the parameter clmn.

When setting gumbel=FALSE a Generalized Extreme Value distribution will be adjusted instead of the particular case of a Gumbel distribution.

Examples

if (FALSE) {
data(climatol_data)
tab <- IDFcurves(prec10min,'My airport',cex.axis=1.2,cex.lab=1.2) #IDF plot

## See the maximum precipitation accumulations in the different time intervals:
tab
}